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    CVE-2026-123611

    rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to send only classical shares and lose post-quantum confidentiality.

    Published:Nov 8, 2026
    Last Modified:Nov 9, 2026
    EPS:Nov 8, 2026
    EPSS Score:0.00188
    CVSS Score:3.7

    Affected Products

    Vendor
    Rustls
    Product
    Rustls
    Vendor
    Rustls Project
    Product
    Rustls

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High